SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e6914e2336bdb65c30792f04f3860b3c97c636db0848191ed9a5c63a02f74d7' 
  AND token = 'eiS6qd4yb2jpK5eUMYUs9C4hXJlhltwBkGxaHa6ZQvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}